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BMR46 series PoL Regulators
BMR46 series PoL Regulators
Input 4.5-14 V, Output up to 50 A / 165 W
Input 4.5-14 V, Output up to 50 A / 165 W
values.
3. Values stored in the user non-volatile memory are loaded
to RAM. This overwrites any previously loaded values.
Once the initialization process is completed, the product is
ready to be enabled using the CTRL pin. The product is also
ready to accept commands via the PMBus interface, which will
overwrite any values loaded during the initialization procedure.
Soft-start Power Up
The soft-start control introduces a time-delay before allowing
the output voltage to rise. Once the initialization time has
passed the device will wait for the configured delay period prior
to starting to ramp its output. After the delay period has
expired, the output will begin to ramp towards its target voltage
according to the configured soft-start ramp time.
The default settings for the soft-start delay period and the soft-
start ramp time is 10 ms. Hence, power-up is completed within
20 ms in default configuration using remote control. When the
soft-start delay time is set to 0 ms, the module will begin its
ramp-up after the internal circuitry has initialized
(approximately 2 ms). It is generally recommended to set the
soft-start ramp-up time to a value greater than 500 μs to
prevent inadvertent fault conditions due to excessive inrush
current. The acctual minimum ramp-up time will however
normally be limited by the control loop settings and ramp-up
times of internal interface voltages in the controller circuit to
approximatley 2 ms. The soft-start power up of the product can
be reconfigured using the PMBus interface.
VIN
CTRL
VOUT
Initialization
time
Illustration of Power Up Procedure.
Output Voltage Sequencing
A group of products may be configured to power up in a
predetermined sequence. This feature is especially useful
when powering advanced processors, FPGAs, and ASICs that
require one supply to reach its operating voltage prior to
another. Multi-product sequencing can be achieved by
configuring the start delay and rise time of each device through
the PMBus interface and by using the CTRL start signal.
See application note AN310 for further information.
Delay
Ramp
time
time
Technical Specification
Technical Specification
1/28701-BMR 464 Rev.B
1/28701-BMR 464 Rev.B
© Flex
© Flex
Illustration of Output Voltage Sequencing.
Voltage Tracking
The product integrates a lossless tracking scheme that allows
its output to track a voltage that is applied to the VTRK pin with
no external components required. During ramp-up, the output
voltage follows the VTRK voltage until the preset output
voltage level is met. The product offers two modes of tracking
as follows:
1. Coincident. This mode configures the product to ramp its
output voltage at the same rate as the voltage applied to
the VTRK pin.
Illustration of Coincident Voltage Tracking.
55
July 2019
July 2019
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